Evaluation of variations in sinonasal region with computed tomography

Figure 2 Axial plane (A), coronal reformatted (B-F) computerized tomography images shows different variations. A: Right sphenoid sinus hypoplasia (black arrow) and bilaterally internal carotid artery protrusion into left sphenoid sinus; B: Bilaterally maxillary sinus hypoplasia and left intersinus septa (white arrow); C: Right frontal sinus aplasia (black arrow) and left frontal sinus hypoplasia (white arrow); D: Bilaterally Onodi cells (white arrows); E: Right maxillary sinus accessory ostium (white arrow); F: Bilaterally ethmomaxillary sinus.